Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7218 CD/HCP4A
7218 CD/HCP4A
Dimensions
| d | 90 | mm | |
| D | 160 | mm | |
| B | 30 | mm | |
| d1 | 111.6 | mm | |
| d2 | 111.6 | mm | |
| D1 | 138.4 | mm | |
| r1,2 | min. | 2 | mm |
| r3,4 | min. | 1 | mm |
| a | 31.9 | mm |
Abutment dimensions
| da | min. | 101 | mm |
| db | min. | 101 | mm |
| Da | max. | 149 | mm |
| Db | max. | 154.4 | mm |
| ra | max. | 2 | mm |
| rb | max. | 1 | mm |
| dn | 117.5 | mm |
Calculation data
| Basic dynamic load rating | C | 127 | kN | |
| Basic static load rating | C0 | 112 | kN | |
| Fatigue load limit | Pu | 4.25 | kN | |
| Attainable speed for grease lubrication | 10000 | r/min | ||
| Attainable speed for oil-air lubrication | 16000 | r/min | ||
| Ball diameter | Dw | 22.225 | mm | |
| Number of balls | z | 16 | ||
| Reference grease quantity | Gref | 27.765 | cm³ | |
| Preload and stiffness (back-to-back, face-to-face) | ||||
| Preload class A | GA | 480 | N | |
| Static axial stiffness, preload class A | 126 | N/µm | ||
| Preload class B | GB | 960 | N | |
| Static axial stiffness, preload class B | 171 | N/µm | ||
| Preload class C | GC | 1920 | N | |
| Static axial stiffness, preload class C | 239 | N/µm | ||
| Preload class D | GD | 3840 | N | |
| Static axial stiffness, preload class D | 349 | N/µm | ||
| Calculation factors | ||||
| Calculation factor | f | 1.09 | ||
| Calculation factor | f1 | 1 | ||
| Calculation factor | f2A | 1 | ||
| Calculation factor | f2B | 1.01 | ||
| Calculation factor | f2C | 1.03 | ||
| Calculation factor | f2D | 1.06 | ||
| Calculation factor | fHC | 1.01 | ||
| Calculation factor | f0 | 14.6 | ||
Mass
| Mass bearing | 1.83 | kg |